/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/Apache-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 *
 */
package com.tencent.angel.sona.tree.objective.loss;

import com.tencent.angel.sona.tree.objective.metric.EvalMetric;

import java.io.Serializable;

public interface Loss extends Serializable {
    Kind getKind();

    EvalMetric.Kind defaultEvalMetric();

    public enum Kind {
        RMSE("rmse"),
        BinaryLogistic("binary:logistic"),
        MultiLogistic("multi:logistic");

        private final String kind;

        private Kind(String kind) {
            this.kind = kind;
        }

        @Override
        public String toString() {
            return kind;
        }
    }
}